Attachment for sadirons



March 16,1926. 7 1,577,127

J. D. KALTENBACK ET AL ATTACHMENT FOR SADIRONS Filed 001;. 24. 1923 INVHVTOR. JOSEPIIQ/fALTEIVGAC/r Ja/wv Jroaz.

Patented Mar. 16 1926.

'. UNITED STATES,

Jos PH n. KALTENBACK AND JOHN stronngoii osnn FRANCISCO, CALIFORNIA.

'ATTAoHMENTroR sADIRoNs; r

. "Application filed October 24, 1923; Serial No. 670,592.

To'aZZ whom it may] concern:

Be it known that we,.JosnPri D.'KALTEN-' BACK and JonN STOLL, citizens of the United States, and residents of San Francisco, county of San Francisco, State of California, have invented a new and useful Attachment for Sadirons,of which the following is a specification.

This invention relates to thermally actuated signals and particularly to signals for use in connection with electrically heated sad irons and an object of the invention is to provide a device of this character which willbe visually indicative of thermal conditions of the iron..

In the process of ironing d'elicate fabrics such as silks, laces and the 1ike, only a low degree of heat is required. When use is made of well known forms of irons, no means are provided which will permit the user to quickly determine thedegree of heat,

and in consequence thereof, delicate fabrics are quickly burned through a direct appli-' cation of too much heat thereto as the iron is passed thereover. Our invention is primarily directed to a novel form of attachment which can be applied to the foot of an iron where'it will besubjected to the direct action of radiant heat and which will include a visible'portion adapted to be automatically extended by thermal action to a visible point outside of the casing of the iron, and directly at a point where it will be clearly discernible to the operator of the iron.

Our invention, therefore, comprises certain new features of construction and arrangement and combination of elements hereinafter set forth and pointed out in the claims annexed hereto.

In the drawings:

Figure 1 is a perspective view of an iron showing the application of our invention thereto; i V

Figure 2 is a vertical section through a pogtion of the iron with parts in full lines; an

Figure 3 is a plan view of our signalling attachment, showing a slightly modified form thereof.

In carrying the invention into practice we use an electrically heated sad iron (5) which consists of the usual form of foot (6) associated in the customary manner with a casing (7 carrying a handle (9) is a socket to accommodate a plug (10) to which the feed wires are adapted to be connected in the usual well known manner; I

- At a suitable point, preferably in fron of thehandle (8), the top wall of the casing (7) is formed with a display opening (11). Arranged in vertical alinement with the opening is a thermally actuated expansible coil (12) which is normally contracted. The

convolutions of the coil gradually increase when thecoil is expanded by thermal action. The opening (11) is so designed as to permit the colored surfacef(16) of the coil to be projected slightly beyond the opening (11) when the coil isv expanded. The coil is so formed that on expansion thereof to expose the colored surface (16) from the opening (11), it will indicate a given degree Fahrenheit of heat so that care on partof the user of the iron can be exercised in instantly turning off the current. In this manner delicate fabrics can be ironed without possibility of undue damage theretoas the user will always have within a convenient viewpoint means visually indicative of the thermal conditions of the iron.

In Figure 3 we use a hollow spiral coil (12) mounted on a plate (13) and secured thereto by studs or the like (13 The lower end of the coil is formed with a bulb (12 which contains an expansible colored liquid. The tube is preferably formed of a clear glass and the small convolution (15) thereof is adapted to register with the aforesaid opening (11) so that when the liquid expands, it flows upward to fill.

the small convolution (15) where its color will be clearly seen by the eye of the user.

We do not wish to be limited to the precise details of construction herein set forth and reserve the right to make such obvious changes in the form and arrangement of parts as may fall within the scope of the hereto appended claims.

We claim:

1. In an electric sad iron, a casing, within said casing a thermally cont-rolled device comprising a helical thermal coil lmving an up ard turn whos v end portion is directed toward the axis of the coil and flattened so as to constitute an effective visual indicator when the coil is expanded axially, said casing: having an aperture towards which the flattened portion oi the coil moves when the coil is expanded and through which the flattened portion may be viewed.

2. In an electric sad iron, a casing, Within said casing a thermally controlled device comprising a helical thermal coil hating an upward turn whose end portion is directed toward the axis of the coil and flattened so as to constitute an etl'ective visual indicator when the coil expanded, and an attaching plate of heatconducting, material secured to the base of the coil, said casing having an aperture towards which the flattened portion of the coil moves when the coil is expanded and through which the flattened portion may be viewed.

JOHN STOLL. JOSEPH D. KALTENBACK. 

